Ivtoltispindle automatic lathe



Feb. 1, 1944. KQHRlNG 2,340,538

MULTISPINDIVJE AUTOMATIC LATHE 1 Filed Dec. 13, 1940 2 Sheets-Sheet l Feb. 1, 1944. E. KOHRING MULTISPINDLE AUTOMATIC LATHE -2 Sheets-Sheet 2 Filed Dec. 13, 1940 Patented Feb. 1, 1944 MULTISPINDLE AUTOMATIC LATHE Erwin Kohring, Cologne-Poll, Germany; vested in the Alien Property Custodian Application December 13, 1940, Serial No. 370,078 InGermany December 22, 1939 Claims.

In order to obtain in multi-spindle automatic lathes with feeding spindle-drum having high output also a great accuracy of the works, it is necessary, that the machine body accommodating the gear elements and tools forms a rigid unit completely protecting and absolutely unsensitive against giving way also of the upper works. With this object in view it has already been proposed, to construct the machine body as a frame, in that the gap between the upper works is bridged on their upper parts by beam or frame stays and the longitudinal carriage and feeding gear elements are mounted on these staying elements.

The known propositions are, however, accompanied by the inconvenience, that the connecting beam seriously impairs for eye and hand the remaining free space between the upper works, that is, impairs especially in multi-spindle automatic lathes of small and deep construction, the clearness of arrangement of the shavings room inside the machine body.

If, however, according to the invention the staying between the upper works is constructed of several parts, for instance as a pair of hollow bodies of preferably cylindrical cross-section arranged below and at the side of the spindle drum, and if their ends are connected, for instance by inserting the same, with the inwardly directed front faces of the corresponding upper work boxes, the above mentioned inconveniences are avoided, and such a staying of or connection between the upper works of the machine body can besides be produced very accurately and therefore very easily and economically. Especially the upper zone of the shavings room is thereby not impeded in the least by the staying space for the adjusting of the tools, and the advantage is even obtained that movements from one upper work to the other can be brought about by. the hollow bodies. These moving elements, whether mechanically or hydraulically operated, are enclosed capsule-like by the staying bodies and thus protected against the fall of shavings, and they enable the transmission of gear branches without complicated and expensive leading off from the most favorable point to other points with exclusion of any disturbing impairing for the surveying of the operation.

The arrangement according to the invention makes it further possible, to utilize the staying bodies for the good mounting and guiding of machine elements necessary for the service, for instance of the tool carriers for the longitudinally moved tools, and the supporting bracket for the transverse carriage can b'eaccommodated by one of the stayings and can be adjusted or secured in different position, or the hollow bodies may be made useful for the longitudinal shifting of the longitudinal and transverse carriages, as cording to the work to be carried out.

An embodiment of the invention is illustrated by way of example in the ac companying draw: ings, in which Fig. 1 shows a four-spindle automatic lathe in front elevation with fixed tool carrier for the tools moved in longitudinal direction and with stationary bracket for the transverse carriage,

Fig. 2 is a cross-section on line A-A of Fig. 1, Fig. 3 shows the automatic lathe in front e1e-' vation viewed from the right hand side of Fig. 1, and

Fig. 4' shows the four-spindle automatic lathe, but with longitudinal or transverse carriage ar ranged on the staying bodies so that the carriages can be moved in longitudinal direction.

In Figs. 1 to 3 the numeral I designates the lower bed part, 2 the left hand and 3 the right hand box-shaped upper work. The driving en! gine is mounted on the left hand box-shaped upper work 2, while the spindle-drum 6 is mounted in the upper work 2 and progressively moves from one operating position into the other. As shown in Figs. 1 and 2, the spindle-drum carries four revolving working spindles I. As shown in Figs. 2 and 3 two cylindrical, hollow staying bodies 4 and 5 are arranged below and at the side of the spindle-drum 6 and effect a rigid spar like connection between the upper works 2 and 3, the ends of these staying bodies being detachably fixed in the corresponding inward front walls of the upper works. The tool carrier 8 is supported on the staying bodies 4 and 5 and can be secured in position on these staying bodies by means of clamping screws 9 shown in Fig. 1. The reference characters l0 and I l designate two supporting brackets carrying the transverse carriages I 2 and I 3, the staying bodies extending through the upper part of these brackets 10 and l I, whereas the lower parts of these brackets are fixed by means of screws M on the front wall of the box-shaped upper work 2. If desired, spacing plates not shownand which may be of any desired thickness may be associated with the screws I4 and upper work 2.

The transverse carriages I2, I 3 are driven in known manner by worm drives 15 through the intermediary of cam shaft 16, cam disc I! and.

a lever l8 hingedly mounted in the brackets I0 and II respectively, the other ends of said levers respectively engaging on the corresponding transverse carriage l2 and IS. The feed drive of the tool axles I9, 2%, El, 22 extending through the tool carrier 8 is effected for instance from the front-side staying body 4 by means of a shaft 24 extending through this staying body and by means of the toothed wheel 23 mounted on this shaft, through the intermediary of a worm drive 25, a cam shaft =26, cams 2'! fixed on this shaft 26 and by four levers 23 to 3B oscillating each one about the fixed axle 29, by four other lever rods 3| hingedly connected with the four levers 28 to 30. Each of these lever rods is Ihingedly connected with. the corresponding end of the tool axles I9, 20, 2|, 22. One of the .tool axles, in the example shown the axle designated by M, has to serve as rapid boringlspindle and therefore must carry out a revolving movement besides its shifting movement in longitudinal direction. This is effected from the staying body which is the :rear one relative to the upper work of the machineI-by the shaft--32 extending in longitudinal :direction :through the staying body 5 and through 'theiintermediary of toothed wheels t3, and 35,:as=shown:in:Fig. -3.

If the tool carrier 36, as shown in Fig. 4, is to be equipped with clamped-in tools, not shown, and if longitudinalshifting movements have to be imparted to the same, the staying bodies 4 and -5 serve as sliding guides for :the carriage 35. The drive is 'then efiected by a vspur wheel 3'! keyedtonthe end of arshaft 3B-extending through the =longitudinal channel of the staying body and by'a spurwhe'el fii fixedon the other end of the shaft and .meshing with spur wheels at, 4! through theintermediary ofza cam :disc 42 keyed on the shaft of the spur wheel 4| by an arm 43, mounted-on the longitudinal carriage 36 and carrying a cam engaging in the curved :groove of drum 42.

In a similar manner the staying body 4 may be'utilized as sliding carrier -for shifting the supporting bracket 44 in longitudinal direction, as shown in Fig. :4, in cooperation with a shaft 45 extending through "the bracket *stays, the drive being then effected by a wormgear -45, a cam drum 4-! and a-shifting arm 48 mountedon the bracket 44 and having a cam engaging in the groove-of thecam drum.

I claim:

-1. A'multi-spindle automatic lathe with feeding spindle-drum and box-shaped upper works with a gap between said upper works being bridged by a rigid staying, comprising in combination with the spindle-drum, several hollow bodies of preferably cylindrical cross-section .arrangedbelow and at the side of said spindledrum and securely but detachablyzfixed at their ends onrthe corresponding upper works, the staying bodies" forming casings, shafts located in said staying bodies, and-gears mounted-on said shafts and operative for effecting certain operation movements ..from one'upper work to the other.

:2. A multi-spindleiautomatic lathe with :feeding spindle-drum "and box-shapedupper works with a gap between said upper works being bridged by a rigid staying, comprising in combination with the spindle-drum, several hollow bodies of preferably cylindrical cross-section arranged below and at the side of said spindledrum and securely but detachably fixed at their ends on the corresponding upper works, a carrier for longitudinal .tools arranged between the upper works, and said staying bodies extending through said carrier.

13. A multi-spindle automatic lathe with feeding spindle-drum and box-shaped upper works with a'gap between said upper works being bridged by .a rigid staying, comprising in combination with the spindle-drum, several hollow bodies of preferably cylindrical cross-section arranged below and at the side of said spindledrumand securely but detachably fixed at their ends on the corresponding upper works, transverse carriages associated with one of said upper works, supporting brackets for the transverse carriages, .the staying bodies extending through the upper portion aof said brackets, a part 10f the lower surface of said supporting brackets being fixed on the wallsof said upper works facing the supporting brackets.

4. A multi-spindle automatic lathe with feeding spindle-drum and box-shaped upper works with a gap between said upper works being bridged by a rigid staying, comprising in combination with the .spindle drum, several hollow bodies of preferably cylindricalcross-sectioniarranged below and at the side of said spindledrum and securely but detachably fixed .at their ends on the corresponding upper works, transverse carriages associated with one-of said upper works, supporting brackets for the transverse carriages, the staying bodies extending through the upper portionoi said brackets, a partof'the lower surface of said supporting brackets being fixed on the walls=of said upper works facingthe supporting brackets, and an intermediate plate of desired thickness interposed betweensaidfixed part of the lower surface of said supporting brackets and the corresponding walllof the upper Works. g r

5. A imulti-spindle "automatic lathe with feed ing spindle-drum and box-shaped upper works with a gap between said upper works being bridged by a rigid staying, comprising in combination with the spindle-drum, several hollow bodies of preferably cylindrical cross-sections arranged below and at the side of said spindledrum and securely butdetachalbly fixedkat :their ends-on the corresponding upper worksya longitudinal carriage carrying tools and .mounted on said staying bodies, a transverse carriage, supportingbrackets for said transverse carriage, the upper portion of saidsupporting brackets being mounted on one of said staying'bodies, and an additional guideadapted to shiftsa'ideupper por tion of .the supporting brackets for said transverse carriage.

ERWIN'LKOHRING. 

